# Toyota Sienna AC Inadequate Cooling

**URL:** <https://community.cartalk.com/t/toyota-sienna-ac-inadequate-cooling/31373>\
**Category:** Maintenance/Repairs\
**Tags:** sienna, airconditioning, toyota\
**Created:** [June 3, 2009, 3:03pm UTC](https://community.cartalk.com/t/toyota-sienna-ac-inadequate-cooling/31373 "2009-06-03T15:03:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Izzy\_Schwartz](https://avatars.discourse-cdn.com/v4/letter/i/7993a0/32.png) [@Izzy\_Schwartz](https://community.cartalk.com/u/Izzy_Schwartz)\
**Post date:** [June 3, 2009, 3:03pm UTC](https://community.cartalk.com/t/toyota-sienna-ac-inadequate-cooling/31373/1 "2009-06-03T15:03:21Z")

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? 2005 Sienna  
  
 ? VIN: 5TDZA23C45S3342304  
  
 ? Build date: 05/05  
  
 ? Engine: 3.3L V-6  
  
 ? Mileage: unknown (available if needed)  
  
 ? Concern: Insufficient A/C Cooling  
  
  
  
 Symptoms/condition/questions:  
  
 ? At idle with AC on, low side 10 psi, high side 70 psi  
  
 ? While charging AC with approx 2lb. of freon, low side 30 psi, high was 150 (ambient temp 80 deg)  
  
 ? High side jumps to 400+ and clutch cycles every 3-5 sec. and compressor relief valve vents freon  
  
 ? Removed enough Freon for high side to jump from 150-250 and low side constant 30  
  
 ? Inlet condenser line too hot to touch, outlet is lukewarm  
  
 ? Both cooling fans running  
  
 ? AC blowing some cool air (maybe ambient-30 deg.?)  
  
 ? Q: Is there an accumulator?  
  
 ? Q: Is there a filter/screen?  
  
 ? Other observations/comments re condition/cause?

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [June 3, 2009, 5:13pm UTC](https://community.cartalk.com/t/toyota-sienna-ac-inadequate-cooling/31373/2 "2009-06-03T17:13:30Z")

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How are you determining you are charging to the correct weight? Have you found the sticker listing your Toyota’s AC system capacity? do you have a scale? are you competent enough to sense when your system is charged correctly by sensing inlet and outlet temperatures?

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**Author:** ![Gary123](https://avatars.discourse-cdn.com/v4/letter/g/c37758/32.png) [@Gary123](https://community.cartalk.com/u/Gary123)\
**Post date:** [June 3, 2009, 5:23pm UTC](https://community.cartalk.com/t/toyota-sienna-ac-inadequate-cooling/31373/3 "2009-06-03T17:23:07Z")

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Sounds like moisture in the system … did you vacuum pump the system? Moisture will freeze on the orifices and block freon flow.